Adam says that the statement number 4 has four factors explain why this statement is incorrect

What ia the sum if the first 7 terms of the geometric series

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.

Lowest fraction using common term 28/35